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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa4312dd86de710f2112580e99839ba475cb0ee1dfb985c24944d77b281d484' 
  AND token = 'ZsmawESsTF9vTY5rJ6o3To32mg+b4oYiWkW3jTqLBjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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