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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1f92daea6927a21f75f95be060ca5c299dd5448733d825cf539dc1c5bdd63f' 
  AND token = '84MaNd7qffzVCw1CZBMkVq4YisNqGEwwii51oy6WHz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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