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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3eb1d5f62599479d1c974a606591aa86f83db91f84d2ee99d4f6d463904bb9c' 
  AND token = 'zGLQPnhJNrhN29rW96WD2bfGBt5OCWFjF6lg+Hk7Cu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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