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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3628aeef4b1777dafb30d991bac3f3ebcee3689db3681d55a1b9b41f67a6da34' 
  AND token = '/FrVBRR3arDMdIgq1w1CkBY+ImnRmo4sPAS77hmYW0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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