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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee84123c34ed0f0140a40e7c8b33c6da4c5f46dca15bfdbfc4e603f8abaa43a' 
  AND token = 'yRRj85zhG5zLi6PsnL4989g8YvcrTiKgoIK+0BX1ruM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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