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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a15d4f6ff9b5389dddcd599207e03e99966df2094a4f0b954adb1b48f364a9' 
  AND token = 'TuC0jlYOBXiywNfVmTYQBfM3VDT2epd+mjO385XBefo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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