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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4dc82f8e4fa1bbeeb3af1e6f9fc2e8a6dfc9c4ab996dd6100596efb1a845fb3' 
  AND token = '7iH6Hxf9kaeSsRsVy0hJEHdmNNLX5qG1q9SqjSC8kvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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