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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2561e2490a794db912a2b9888db83d9b5bd831ad5fd75ed29f26f665172cd05e' 
  AND token = 'KjhnCFsvDytXUSbPp/qpjo2OM0AAkwR86UK++2+8R6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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