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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6dc2e2e955e7827f7e8617a562aed9f49710d8d574fd75a440ffeb2ef81f12' 
  AND token = 'ftEzUQqMHZZbDSUiOfUJJGfn/03j/cxqXP1sOz3XQCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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