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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88cf70d15044b7bf456ca98694597faddea3f5b1e6097abe4c215a655343dac9' 
  AND token = 'aVCFXA6azimoKgOjJPzpR+jwUYA3ODWc2eyT+cfLtr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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