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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff0040ff2c28546d120872412bb5e35716eacbfcdafed6604f262aad23e5e37f' 
  AND token = '3eKXMuJ+9gMYl0a+nMGvJwSlgQbnwEBigRzNmglezpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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