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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8742edd7e391e9cf0fb1bc8902a8c3664ee134332a0f56c8502b172c5fd3cb' 
  AND token = 'WLwauae0wlBe65BhTk8xyyz08SuxeKfFx97yhXhxXLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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