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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba3679ca44b0572b8029cc315a2f31d06f906f07623fab5909b7eb36850469d' 
  AND token = '9JFepdJ2DH3Nh30d6PaB2i/zOwZ6hQJ8JvkR7IHh36Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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