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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51ac806da8e7ffd98cd7ffd4073f5f7d63f7fd2526c5b79e050b7216c1f81f5f' 
  AND token = 'y5Tu+kjfod3d07jqfINTAog+bn9/+Tk6kyXtCppPEi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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