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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15efdfb67c075dba241c02fcfeb28ef95d1de42f49ebb0db3f285ccaed9efb8' 
  AND token = '8H5160Pk9xVg/2jgKq1qHvgx5J+dKogM1e+MsWr6F6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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