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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b44078b648aefe961c44892649079d68177415ec5bb807f45bafb45be7108f' 
  AND token = 's4yM8NT1mx6XEcvYMWWeBmc/d5VnGMsULrs32Hrw7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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