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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c567b3d1b1854e8b3c287ec7f458029d723c70f60d69c6edba77bd2a914b07' 
  AND token = 'mlqdOEp0emSGqICf+107VeqZsjgW5FYFDgJr2B9FBYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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