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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73a6ddd0289ece40993bd76e9ecacb6bbe9ab480e6c7415b57ce9c633b64988' 
  AND token = 'DTGzggGa0G5zj2FM+EFsIShHMBWXVRLbB2SmNBsKcP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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