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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8550297905239381656747b43fb519a22a01c50499926156e0f4d4318f55198a' 
  AND token = 'xja8tsx1iQU3d1eygMVWlU7qR7LJhrhjJxCexU6g2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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