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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552384fa4a4559a6d44029eec254170a58a41982adc50c2eb05da26925d05d17' 
  AND token = 'nNre5wNZCQ3vy6ExWx+wCp6S3Sbybc5EoVTsARIQPwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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