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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd9b9bda9c19de6d782dea7e22f48d86a2beb4e4c48c816c15042a105979c62c' 
  AND token = 'l0xyAFpxoJ3UdPbIQMrs7xjSkn54tVABmVz2OJm59zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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