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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a94eef4eff9c596ac4c26500d183888cf7aed818df4cd335659fcde6051fb39c' 
  AND token = '6kL1/qK0PV371XgXZOITxP/BPh50/P4eaIK050jOYnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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