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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d24bd0bbcd31eaaaf1a975f7a8a9020e4a981985bf46d7b80e5f497f0461c8a' 
  AND token = 'MkUhcnJlDFxXEiBEMfqObBxTY/wwoKpf1Ep8u5En8WU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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