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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f53ff5b6eb6f26f4d76fb539d0abb31f70cc7c25abe9e1565d4ffd8e0a485d4' 
  AND token = '3PongL1hSUzAmOIa4ekl1LZpy1MIV4KzGjXnFVGx9S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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