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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1be83e58c286440599cfe14a979e5204c776c7494737706d71fb136c4c996f0' 
  AND token = 'jZ3/1kdSGEJUVjiI3PQkstk+sxJ6PjfQZgIcSUS/NKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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