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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4491c9e5b23c9f7f88bbab682ee34c89b175cff4ce61e39710a71af07fb8a0cf' 
  AND token = '3UBCw1dg2QxUz1qRWggeKNqTIBOZAOmSYlqR+bQW93w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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