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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472d6702d01b98c518df1f0bc287e654570f9a3ea30524242d3b99d25ffffb7b' 
  AND token = 'l56iZGdZ+kePxSdANfWdJjD0Yqsn/+9C3RWyriBMK9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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