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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da3d5e9c5e1f67432212cce0f4a84c3ece0f776d099016acde923a1d95209f5' 
  AND token = 'MYiS7rfv3QCVI2hWqXS2UaExnU8Kyb9QEtV7Qc2anms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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