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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34a5eb0b483e5361dc64c0ae0d2ed629341633977dfa4e47e8df8d6959427e17' 
  AND token = '3g/AC5A62vagUCe7WTgv0riO11uMC8pmMRUr5kykDVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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