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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c99aaf516a4787c6f4b4bb1352a7713bd7cfa1e66347c911f5b98630ac413d1f' 
  AND token = 'ImntiOHHLj9p8GU4dlsRTdXylSfT9pLAiESw3xobhHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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