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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcfd2dc5979b99cb297fcad60df241c3c1078c43c0581eac6698ce58551bafd' 
  AND token = '5FesgGMm2jHFV1G6Qep6qGtK0mf8URlYIHjdmz/HJRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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