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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdd4adc8d3ee5f2877dd28996d91df151a27ddc39b4ca2943c5dbf66a4bf089' 
  AND token = 'bpM5J2H+RnjedoVsXIhFkmrV3iYAjv39QdsLyoibTQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}