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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39626d310de950b06a8d9a89ddde691b140603f2f4864df931343b5b6ad6e9f8' 
  AND token = 'v4PkMpF4cBzRCe9owiRh5Mto6cgQ/fgwD6gXdwGWDHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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