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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ee692bb911a147f7cafe9d04b62dd3a5dfb7e3fd651ebedefcf8b58988818c' 
  AND token = 'mUblq/cZzigVS1ZYs7zHTfOsGR8jruirdmAgZMKNHUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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