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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5aa7796ec0bca6ccf3dc6f4e0e94ccd21bed5e7a78665ab367ad541fb3ebe70' 
  AND token = 'bT1zdMYi3r6w6s387Wf0l1D/QINny8pAcRir6CEWtEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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