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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fa8cf0207b02313313ee37e7e5041eb563782c80a43512c15d4393e88dcbe4' 
  AND token = 'GFMskmFhscCKR/6LDQ3ru/OFiDcfwLWv81I8cOjp0r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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