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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd1599f98b8862bae17ff11b6fe976597e64afea185cf91e10d87822fbf828c' 
  AND token = 'gYzRmmPF9r2iFKYHMW9cDw/CvVzrxmt5KhaSHg+ZFDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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