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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '645b49ec4195aa54718eea4d10d6cf27eaba32825da3d714e19ff32e2809b0f3' 
  AND token = 'tUJD8+ECDZsutwIJRvmHDLFLsM4uHCEqbuzlyjxmr2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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