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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71743190c8532b30cc733064e2c9a46bb934d2245d45a5fb720cf683270d2669' 
  AND token = 'X0C/VyVqpxWekvTWVjj1YvsdQZqkJ92Wr1a7XeQcr2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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