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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fb7ca0731ee660eab56be4a2c70666bf6b692407925acc194c1b67bbb9d646' 
  AND token = 'KyOxFJNHMfvzD2D9ICdBMKF6DHvfF+gmoGoxYx4LD5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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