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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa836acd28b3dbd190280d445281dd539ce8d8ecd097e52e58783b35e95248ed' 
  AND token = 'ugS/FNNHWkW+m61xdrLNAoNQ8IvgaMHZBcF28VZywAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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