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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5ad21d93894329c37a714424c9596cef708625c659723353d56f7a38debe50' 
  AND token = 'OTOCAIv6kWUScGeX+yeVOuEGWW4aC0Kv58H5+ueq+A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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