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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5684d17425f38affb35c75f092d0475f8da3b41b262336f5fa8a2b3cdd9d7ef' 
  AND token = 'CcRRicBjtEudp095BpjD2GNKF7tC/D9OR43+tvVaFcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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