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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230ac50f9a1cd0841b2adba7248ffe3f8a2ba558ee36cfb620217204ec7c739e' 
  AND token = 'WR3MuRYb7um0PokvRuho0TmJTYlHmTxj+AEwxsXKNfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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