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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5199c8961040e7af3f46af17d730a36afda27cb20676bbbf2bc0e0c3f770e5fb' 
  AND token = '+Lc2MpjJgAoENOeJS3EaqBks1SxJyiw4ObVuCas1QIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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