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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca74995045ad4d84f2c4339cfedcbe05f4366d708c6bd5e2c85d9515d8f0903b' 
  AND token = 'nxMsHCUi7U4UNHfWCOd5xC8H0aegPJ7p4AANFM5pvxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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