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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94c9aeb8c4f3014c2f3aa9cd17067f8d12a9682f0d9604f1cefb59842bc04bd' 
  AND token = 'CPESDA3DsFfXS7OSE7iylQc3dLGqiKVka9uqZoTp848=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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