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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a562b44b31bd3ce6ebbdb6ca2b906f208f9d8d456fd6c7bcc152c044aecbf25c' 
  AND token = 'qz0MCU6u1jAFj9bQbhmjkUJWWmWsq3a2xeXj2R5G3L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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