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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc9e7319e37e0744c976c1d562a892e93cdcd35155df6eda9e3c7fe2eb2636f' 
  AND token = '97XDbGSEZd0aN/NFmp6LZbE8ipknf5buTdDIElQob5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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