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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd35daab2eb9fc89522d0d971226ab3fb5c143569d3a1b25da1779121c79b5a' 
  AND token = 'jy/+OSwN+vlKCnLuYIG+Qv+0dSiPx4Th7CaQFHdh7xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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