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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb5749c748c8d4d59f01c74921f9adc59926720be3bf46bf9dbae31575bf3767' 
  AND token = '7hy9gYO8ocbO/L22NA/KzL+dDO0vOEbIHdjcXY351xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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