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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989ad3e7be49a931416e930f70b4bfaf0615d4466918d85f094f2364d7c4696d' 
  AND token = 'odHLJqm+s0LViC1CExXTEhXFM58IS/5LBrTrIG/T5lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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