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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61c242468419c454735b43c92646429bfa6bfec6b0f52af92de49a55d47f243d' 
  AND token = 'ejuPBSrRYT1rmt0XLsf4r7L7impCdyWg+T8ZWnDMFvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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