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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7e9997890ef8c226c53539ad1091fc5ec4b7c3571a5cfab06bc2b16de2c53a' 
  AND token = '2z/7kOfYjLytncI0dzFvxd9DgqCvn+e9qMIatbXCq2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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