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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b64b6e519846561f512fc5e3c28d98aab5fc76b6a70f0780b55137942af5f19b' 
  AND token = 'XbClPzcn6rHHqCfMVrhwnuOTf1l1hXPm5Eh7Ih05l4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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