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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78036d857bb973f9c3c7c2fe76c74ee730e4d27f726c523e29e7f916d3ff80e' 
  AND token = '72cFxASwk1npsORjYcHxKwBeE5gT5Ybd7GqcFMH5PQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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