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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeba0932d7a59e94260332775ad64d4618b28a890bf001eee6c3a0fdbd92a29e' 
  AND token = '4mlW6NT7qQ4+8EsAepnioboileE3v51iJ0Z4snMdMHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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