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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47063bd13c136097bd70cbcf38cd4130722b4217c5283b0c89a2a9a952af0c8' 
  AND token = 'jM+pdPEK1udMmA9nUwIcI376u102VOCe9kX27GX94b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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